Plants are not passive organisms they perceive and respond to environmental changes including ultrasonic sounds or vibrations. This review explores the different mechanisms behind ultrasonic emissions, plant adaptation and important implications for agriculture. Different environmental factors affect plant growth, such as drought, salinity, light, temperature and elevated CO2. Plants communicate with each other and other organisms, such as insects or herbivores. Plants emit ultrasonic sounds that are not audible to humans. Plants communicate with each other by forming fungal networks and releasing volatile organic compounds (VOCs). Microphones can detect the airborne sounds of plants to record the frequency range of 20–100 kHz. The results have revealed that plants produce mean peak frequencies and mean peak sound intensities. The mean peak sound intensity of tomato and tobacco plants under drought conditions is 61.6 ± 0.1 dBSPL & 65.6 ± 0.4 dBSPL respectively. The mean peak frequencies of tomato and tobacco plants under stressed conditions are 49.6 ± 0.4 kHz & 54.8 ± 1.1 kHz, respectively. The stressed plants emit more sounds than unstressed ones. The cut tomato and tobacco plants emit sounds 25.2 ± 3.2 and 15.2 ± 2.6, respectively, per hour, but the Control plant can emit only one sound per hour. The estimated propagation range depends on the frequency and intensity of sounds. The Ultrasonic sounds plants produce may show warning signals for neighbouring plants to produce chemicals or defence mechanisms. Plants use subtle signals to adapt to environmental changes, which has important ecological implications for agriculture. The detection of these sounds can take place by different ultrasonic tools, farmers can perform different agricultural actions to grow plants properly and increase crop yield.